Bolt-anchor.



H. W. PLEISTER.

BOLT ANCHOR.

APPLICATION FILED ocT. I6. I9I5.

2 SHEETS-SHEET I.

. I 15 ,l5 J i? 12 mgl l l5 23 2Q @WW /1 TTU/MIE Y H. W. PLEISTER. n

BOLT ANCHOR.

APPLICATION FILED oc. 16. 1915.

1,222,987. PatenesfiliSi1291.7v l' I @ya Y e y 1 g l 6 mgm' 624 HENRY w. rLEIsrER, oE wEs'rEiELD, NEW JERSEY, AssIGNoR 'ro HENRY E. NE'WHALL.

BOLT-ANCHOR.

Specification of Letters Patent.

Patented Apr. 17, 1917.

Application filed October 16, 1915. Serial N o. 56,239. l

To all whom z' may concern:

Be it known that I, HENRY W. PLEISTER, a. citizen of the United States, and a resident of Westfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Bolt-Anchors, of which the following is a specilication, taken in connection with the accompanying drawings, which form a part of the same.

My invention relates to a new and improved bolt anchor.

More specifically my invention relates to a bolt anchor which can be` manufactured at the minimum expense dueto the saving of material. My bolt anchor may be made out of either comparatively hard metal, such for example as malleable iron, or similar material, or it may be made out of a coinparatively soft metal, such as allead alloy, or similar material', which is softer than the metal of the screw, bolt or other expanding member employed with the anchor, and which will permit the male threads on the expanding member to cut their cooperating female threads in the bolt anchor.

When my bolt anchor is made of c0m' paratively hard metal I preferably cast the coperating female threads in the bolt anchor.

My invention further relates to the method of casting wherein I obtain my new and improved bolt anchor by casting directly from the pattern without the use of cores.

I have shown in the accompanying draw- 4 ings several illustrative embodiments of my invention, but of course it is to beunderstood that my invention is not to be confined simply to the forms illustrated. In these drawings the same reference numerals refer to similar parts.

Figure l is a side elevation of the preferred form of my bolt anchor formed of two units, and shown mounted in a hole or support and prior to being expanded, the support being shown in section;

Fig. 2 is a vertical section through my improved bolt anchor after it has been expanded by the lag screw shown, or any other suitable means, the support and the article supported being shown in section;

Fig. 3 is aview partly in side'elevation -ing a substantially and partly in vertical section of one of my bolt anchor rods or bars which may be used as a bolt anchor or which maybe broken into one or more units, if a bolt anchor of less holding capacity is required;

Fig. 4 is a vertical section of a bolt anchor formed of three units lbroken from the bolt anchor rod shown in Fig. 3;

Y Fig. 5 is an end elevation substantially on the line 5-5 of Fig. l looking in the direction of the arrows, showing the units formcylindrical bolt anchor and prior to their expansion;

Fig. 6 is an end elevation substantially on the line 6 6 of Fig. 2 looking in the direction of the arrows and showing the bolt anchor expanded. In this ligure, as well as in Fig. 5, the support purpose of clearer illustration;

Fig. 7 is a detail enlarged vertical section of one of my bolt anchors formedof a plurality of units;

Fig. 8 is an end elevation and horizontal Y75 section substantially on the line 8*8 of Fig. 7;

Fig. 9 is a detail view showing a bolt anchor formed of one unit broken' off of the bolt anchor rod or bar illustrated in Fig. 3; so

Fig. 10k is a side elevation of one of my bolt anchors formed of ductile material, such for example as an valloy of lead;

Fig. llk is a view similarl to 'Fig'. 3, showing a bolt anchor rod or bar formed of a plurality of units cast of ductile metal;

vFig. l2 is a detail of one ductile unit broken from the rod or bar illustrated in Fig. 11. f

In the illustrative embodiments of my in-v vention shown in the drawings, l is a bolt anchor' formed preferably oftwo or more units 2 and 3, the unit l2 having an open side 4 and the unit 3 having an open side 5, the open sides being other and preferably formedv staggered. Between each unit and its adjacent unit there is a connecting member formed of two arms 6, c

clined surface 7 and the open side 5 is provided with aninclined surface 8, the two is omitted for the 70 at an angle to each 95.

.The open side 4 is providedwith an in- 100 form an inclined bore 9 which is interrupted or bro-ken opposite the open sides 4 and 5 of the units.

I preferably, though not necessarily, form the'units 2 and 3, so that in their unexpanded position they will substantially form a cylinder which, of course, would not be continuous throughout the length of the bolt anchor due to the units 2 and 3 having open sides.

In locating my bolt anchor in a wall or other support 10 the hole 11 is drilled or otherwise formed substantially at right angles to the face 12 of the support, the hole being of about the same depth as the length of the bolt anchor. The length of the latter is determined by the number of units, one or more, to obtain the desired holding capacity for that particular bolt anchor. l/Vhere there is but little strain or stress to be carried one unit 2 may be used, Fig. 9, or two units may be used as shown in Figs. 1 and 2, or three units may be used as shown in Fig. 4, or any greater number, as for example, that shown in Fig. 3.

Aft-er the bolt anchor 1 is inserted in the hole 11 the work to be supported 13 is brought up flush with the surface 12 of the support 10 and the expanding member, as for example a lag screw 14, is passed through the work 13 and into engagement with the respective inclined surfaces 7 and 8 of the units 2 and 3. Vhen the-se units 2 and 3 are formed of a comparatively hard metal. such for'example as malleable iron, I preferably provide them, in a manner to be hereinafter described, with female screw threads 15 to coperate with the male threads 16 carried by the lag screw 14. As the lag screw is screwed home down theJ bore 9 and in engagement with the cooperating female screw threads 15, 15 in the opposite inclined surfaces 7 and 8, the lag screw will cause a tremendous expansion, wh-ich, in the unit 1 for example, will begin some little distance back from the outer end 17 and reach its maximum, in that unit, at the point 1S. On the other unit 3 the expansion will progress from the point 19 and reach its maximum at the point 20. This action will insure a powerful gripping action between the bolt anchor and the support, whether that `support be brick, masonry, concrete, tile, stone orV any other material. A

I preferably, though not necessarily, provide the bolt anchor 1 with one or more lugs 21 which may be bent suliiciently to form a support for the lag screw 14, or other'expanding member. These lugsvmay also hold the lag screw to the bolt anchor for purposesof shipping or storing.

v In the expanding action which I have just described, the connecting member formed of the arms 6, 6 will of course bend slightly to metal, the saving of which permits me to manufacture my bolt anchor at minimum Y expense.

I further cheapen the cost of my bolt anchor by my new and improved method of manufacturing it. By my method I make substantially a cylindrical bolt anchor, by casting, without the aid of a core or cores. rlhat is, I cast the axial bore of my substantially cylindrical bolt anchor from the patterns direct. At the same time I cast the entire bolt anchor including the female screw thread-s 15, 15V andthe inclined surfaces 7 and 8 all in one operation, and all directly from the pattern.

By reference to Fig. 3 it willbe seen that the open sides 4 and 5 are staggered with relation to each other and that there is an interruption between the female threads 15 in one unit and the female threads 15 in the adjacent unit. This permits the patterns to be drawn from the sand in two directions land entirely avoids the necessity of using cores which in themselves would materially add to the expense.

By my invention I may cast a rod or bar 24, Fig. 3, of a plurality of units 25 and 26 which may be several feet in length. For convenience in handling and shipping these bars or rods 24 may be shipped direct to the Vjobber or retailer or user, who may use the entire bar as one bolt anchor or may break off one or more of theunits to obtain a smaller bolt anchor and one of the particular holding capacity that he may need for the particular workto be supported. IIe may for example,'break off one unit, Fig. 9, or he may break 'off two units, Figs. 1 and 2, or three units as shown in Fig. 4, or any number that may be necessary simply by severing the connecting member 6, 6 between any two units.

My invention is equally applicable to bolt anchors formed of some ductile material in which the screw of the expanding member will cut its own coperating screw threads.

I have shown for example such a ductile bolt anchor 27 formed of the units 28 and 29, the unit 28 Vhaving an open side 30 and a smooth inclinedsurface 31,7the unit 29 having an open side 32 and a smooth inclined surface 33, the two units being'connected together by a connecting member 34 formed of two arms, in all essential particulars the same as the arms 6, 6, in the other form.

connection with t-he illustrative embodiments thereof to the details of which I do not desire to be limited what is claimed as new and' what it is desired to secure by Letters Patent is set forth in the appended claims.

What I claim as my invention and desire to secure by Letters Patent is l. An article of manufacture comprising an eXpansible bolt anchor having a plurality of open sides.

2. An article of manufacture comprising an eXpansible bolt anchor having a plurality of open sides, said open sides being at an angle to each other.

3. An article of manufacture comprising an expansible bolt anchor 4having a plurality of open sides arranged staggered with relation to each other.

4. An article of manufacture comprising an expansible bolt anchor formed of a plurality of units, each unit having an open side and a connecting bendable member between the units.

5. An article of manufacture comprising an eXpansible bolt anchor formed of a plurality of units, each unit having an open Copies of this patent may be obtained for five cents each, by addressing the Commissioner side and a connecting bendable and breakable member between the units.

6. An article of manufacture comprising a substantially cylindrical bolt anchor having a plurality of open sides.

An article of manufacture comprising an eXpansible boltl anchor having a plurality of open sides7 said bolt anchor provided with an internal bore having a plurality of tapers.

8. An article of manufacture comprising an eXpansible bolt anchor having a plurality of open sides, said bolt anchor provided with an internal borev having two tapers to be lsjuccessively engaged by an expanding mem- 9. An article of manufacture comprising an eXpansible bolt anchor rod fo-rmed of a plurality of units, each unit having an open side and breakable connecting members connecting the units to permit a bolt anchor of any required length and of one or more units being broken off from the rod to form a bolt anchor. p

10. An article of manufacture comprising a bolt anchor having a plurality of staggered open sides, each open side being provided with screw threads.

11. A bolt anchor comprising a plurality of units and means between the units adapting them to move in opposite directions about a point intermediate the length of the bolt anchor.

HENRY W. PLEISTER. Witnesses:

A. M. WILLIAMS, M. R. RYAN.

of Patents.

Washington, D. C. 

